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10 Aug 2009

Volume 95, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 95, 062501 (2009); http://dx.doi.org/10.1063/1.3200226 (3 pages)

O. Vávra, W. Pfaff, and Ch. Strunk
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High-throughput indentational elasticity measurements of hydrogel extracellular matrix substrates

Dexter J. D’Sa, Elena M. de Juan Pardo, Rosalia de las Rivas Astiz, Shamik Sen, and Sanjay Kumar

Appl. Phys. Lett. 95, 063701 (2009); http://dx.doi.org/10.1063/1.3197013 (3 pages) | Cited 1 time

Online Publication Date: 10 August 2009

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Much interest surrounds the effect of extracellular matrix (ECM) elasticity on cell behavior. Here we present a rapid method for measuring the elasticity of synthetic ECM substrates based on indentation of the substrate with a ferromagnetic sphere and optical tracking of the resulting deformation. We find that this method yields order-of-magnitude agreement with atomic force microscopy elasticity measurements, but that the degree of this agreement depends strongly on sphere density and gel elasticity. In its regime of greatest accuracy, we envision that this method may be used for high-throughput characterization of ECM substrates in cell biological studies.
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87.18.-h Biological complexity
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure
62.20.D- Elasticity
81.40.Jj Elasticity and anelasticity, stress-strain relations
82.70.Gg Gels and sols

Biolubricant induced phase inversion and superhydrophobicity in rubber-toughened biopolymer/organoclay nanocomposites

Ilker S. Bayer, Adam Steele, Philip Martorana, Eric Loth, Scott J. Robinson, and Darren Stevenson

Appl. Phys. Lett. 95, 063702 (2009); http://dx.doi.org/10.1063/1.3204689 (3 pages) | Cited 7 times

Online Publication Date: 13 August 2009

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We present a simple technique to fabricate rubber-toughened biopolymer/organoclay nanocomposite coatings with highly water repellent surface wetting characteristics and strong adhesion to metal surfaces. The technique combines the principles of phase inversion and atomization of multicomponent polymer/organoclay suspensions containing a biolubricant as the nonsolvent. The biolubricant was a blend of cyclomethicone/dimethiconol oil with fruit kernel oils. The ternary system of cellulose nitrate/solvent/biolubricant was blended with rubber dispersed organoclay nanofluids. Natural, synthetic, and fluoroacrylic latex rubbers were used for the purpose. Self-cleaning superhydrophobic coatings were obtained from synthetic and fluoroacrylic rubbers whereas natural rubber containing formulations resulted in sticky superhydrophobic coatings.
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87.85.Rs Nanotechnologies-applications
87.85.J- Biomaterials
81.65.-b Surface treatments
68.08.Bc Wetting
68.35.Np Adhesion
82.70.Rr Aerosols and foams
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